Dog runs past (5)
I believe the answer is:
rover
'dog' is the definition.
(Rover is a common name for a pet dog)
'runs past' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'past' becomes 'over' (both can mean finished).
'r'+'over'='ROVER'
(Other definitions for rover that I've seen before include "Pirate; dog's name" , "One who wanders about" , "Wanderer, archery mark" , "Nomad" , "Car - dog" .)